RENR6482-03July 2009

416E, 422E, and 428E Backhoe LoaderHydraulic System416E:SHA1-UPCBD1-UP

422E:HBE1-UP

428E:SNL1-UP

Printed in U.S.A.© 2009 Caterpillar, All Rights Reserved

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO - WAY THREE - WAY FOUR - WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)

PUMP(2 - SECTION)

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

PRESSURECOMPENSATION

PUMP(VARIABLE & PRESSURE

COMPENSATED)

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVE ENVELOPES VALVE PORTS

FLUID CONDITIONERPUMP OR MOTOR

FLUID POWER SYMBOLS

UNIDIRECTIONAL

BIDIRECTIONAL

RELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED

HYDRAULIC PUMPS

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID &PILOT OR MANUAL

SOLENOID SERVO THERMAL DETENT

HYDRAULIC & PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

2 POSITIONINFINITE

POSITIONING

FLOW IN ONEDIRECTION

FLOW INEITHER

DIRECTION

3 POSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

MAIN AUX

LINE RESTRICTION(VARIABLE & PRESSURE

COMPENSATED)

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FLUID STORAGE RESERVOIRS

CROSSING & JOINING LINES

VALVES

PILOT CONTROL SYMBOLS

COMBINATION CONTROLS

BASIC COMPONENT SYMBOLS

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

INTERNALSUPPLY PRESSURE

COMPLETE

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

HYDRAULIC SYMBOLS (ELECTRICAL)

ELECTRICAL SYMBOLS TABLE

325-AG135 PK-14

HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG”

325-PK-14

WIRE GAUGE

WIRE COLOR

CIRCUIT NUMBERIDENTIFICATION

WIRE NUMBER IDENTIFICATION CODES

CURRENT STANDARD

PREVIOUS STANDARD

ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE

325-PK

WIRE COLORCIRCUIT NUMBER

IDENTIFICATION

B

WIRE

WIRE

(EXAMPLE VALVE)

CURRENT STANDARD

TRANSDUCER(FLUID)

MELECTRIC MOTORTRANSDUCER

(GAS / AIR)

G

GENERATOR

PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)

TEMPERATURESWITCH

PRESSURESWITCH

TEMPERATURESWITCH

LEVELSWITCH

FLOWSWITCH

ELECTRICAL SYMBOLS (ELECTRICAL)

A

CIRCUIT NUMBERIDENTIFICATION

WIRECOLOR

WIRE GAUGE

T

RE

NR

6482-0

324 P

ag

e,

(Dim

en

sio

ns:

34 i

nch

es x

28 i

nch

es)

TapNumber

SchematicLocation Description

T1 C-3 STEERING AND IMPLEMENT PUMP DISCHARGET2 C-2 LOAD SENSING

SOS B-1 OIL SAMPLING

Tap LocationsPressure, Sampling, and Sensor

MachineLocation

SchematicLocation Description

416E 422E 428E1 C-7 ACCUMULATOR GP - RIDE CONTROL2 B-1 COOLER - TRANSMISSION HYDRAULIC OIL

CYLINDER GP - BACKHOE BUCKETCYLINDER GP - BACKHOE BUCKET (WITH SENSOR) 210-7085CYLINDER GP - BOOMCYLINDER GP - BOOM (WITH SENSOR) 246-9885CYLINDER GP - EXTENDABLE STICKCYLINDER GP - EXTENDABLE STICK (WITH SENSOR) 210-7097

6 C-7 CYLINDER GP - LIFT (LH) 228-3508 215-7298 N/A7 B-7 CYLINDER GP - LIFT (RH) 214-93738 A-7 CYLINDER GP - MULTIPURPOSE BUCKET (LH)9 A-7 CYLINDER GP - MULTIPURPOSE BUCKET (RH)10 F-6 CYLINDER GP - STABILIZER (LH) 262-704911 F-6 CYLINDER GP - STABILIZER (RH) 262-705012 A-3 CYLINDER GP - STEERING

CYLINDER GP - STICK 210-7078CYLINDER GP - STICK (WITH SENSOR) 210-7077

14 F-3 CYLINDER GP - SWING (LH)15 F-3 CYLINDER GP - SWING (RH) 278-197116 B-7 CYLINDER GP - TILT N/A17 B-7 CYLINDER GP - TILT (LH) 192-388418 B-7 CYLINDER GP - TILT (RH) 192-388419 B-1 FILTER GP - OIL20 D-5 MANIFOLD GP - CONTROL (BACKHOE) 259-674221 D-7 MANIFOLD GP - CONTROL (BACKHOE) N/A22 C-5 MANIFOLD GP - CONTROL (LOADER) N/A23 C-5 MANIFOLD GP - CONTROL (LOADER) 259-674324 C-6 MANIFOLD GP - RIDE CONTROL25 B-4 PUMP GP - METERING26 B-2 PUMP GP - PISTON (IMPLEMENT AND STEERING)27 C-7 SWITCH AS - PRESSURE (RIDE CONTROL)28 A-3 TANK GP - HYDRAULIC

VALVE GP - BANK (BACKHOE) (6 BANK) 248-0483VALVE GP - BANK (BACKHOE) (7 BANK) 248-0484VALVE GP - BANK (BACKHOE) (8 BANK) 248-0485VALVE GP - BANK (BACKHOE) (6 BANK) N/AVALVE GP - BANK (BACKHOE) (7 BANK) N/AVALVE GP - BANK (BACKHOE) (8 BANK) N/AVALVE GP - BANK (LOADER) (2 BANK)VALVE GP - BANK (LOADER) (3 BANK)VALVE GP - BANK (LOADER) (2 BANK)VALVE GP - BANK (LOADER) (3 BANK)

248-0481248-0482

N/AN/A

33 A-5 VALVE GP - CONTROL (AUXILIARY) (LOADER)34 E-4 VALVE GP - CONTROL (AUXILIARY) (BACKHOE)35 E-3 VALVE GP - CONTROL (BOOM)36 D-2 VALVE GP - CONTROL (BUCKET)37 D-1 VALVE GP - CONTROL (EXTENDABLE STICK)38 C-5 VALVE GP - CONTROL (LIFT)39 D-6 VALVE GP - CONTROL (STABILIZER) (LH)40 D-6 VALVE GP - CONTROL (STABILIZER) (RH)

VALVE GP - CONTROL (STICK) (6 BANK)VALVE GP - CONTROL (STICK) (7, 8 BANK)

42 D-3 VALVE GP - CONTROL (SWING)VALVE GP - CONTROL (TILT) (2 BANK)VALVE GP - CONTROL (TILT) (3 BANK)VALVE GP - CONTROL (TILT) (2 BANK)VALVE GP - CONTROL (TILT) (3 BANK)

259-6731259-6730

N/AN/A

45 D-6 VALVE GP - SHUTTLE 8J-6875

162-3960214-2202

3 F-2210-7086

N/A

4 F-3210-7074

N/A

5 F-1210-7098

N/A

N/A185-1839

173-4565173-4565

185-1839

214-5097

13 F-2210-7080

N/A278-1971

278-1973206-3553

N/A

210-6243N/A

259-6744259-6745

N/A245-8780247-7868296-6714304-5696245-8777

N/AN/A

N/A29 E-1 thru E-5

248-0486248-0487248-0488

E-1 thru E-530

259-6739

259-6729259-6733

32 A-5 thru C-5247-9656

N/AN/A

247-9655

259-6738

259-6737259-6734259-6732259-6746

41 D-2

PartNumber

Component Locations

N/A

259-6746259-6736259-6735

31 A-5 thru C-5

43 B-5N/AN/A

259-6740259-6741

44 B-5

45

(37) Extendable Stick Control Valve(41) Stick Control Valve(36) Bucket Control Valve(42) Swing Control Valve(35) Boom Control Valve(34) Auxiliary Control Valve(20/21) Control Manifold(39) Left Stabilizer Control Valve(40) Right Stabilizer Control Valve

37 41 36 42 35 34 20/21

39 40

BACKHOE VALVE

The 416E, 422E, and 428E machines are equipped with a mechanically controlled back-hoe valve that is visible with the floor plate at the rear of the cab removed.

The pump is located below the cab floor plate. The pump control valve is mounted on top of the pump and contains a flow compensator spool and pressure cutoff spool. The implement and steering pump supplies oil flow to the loader valve group, backhoe valve group, and steering system. These illustration shows the implement and steering

pump out of the machine. The following components are visible:

Load Sensing pressure tap (T2), Pump Discharge pres-sure tap (T1), Hydraulic Oil Tank (28), Oil Sampling port (SOS), and Hydraulic Oil Filter (19)

T2T2

T1

T2

SOS

T1 (28) Hydraulic Oil Tank(26) Implement and Steering Pump

IMPLEMENT AND STEERING PUMP

COMPONENT LOCATIONS

RIDE CONTROL

SOS

(26) Implement and SteeringPump

The 416E, 422E, and 428E machines are equipped with a mechanically controlled loader valve.

LOADER VALVE

3343/44

38

22/23

2826

19 25

19

2

2

25

28

26

12

12

7

6

18

16

9

8

11

10

13

4

4133

3

14

15

5

5

24

241 27

1 2731

31

32

32

30

30

29

29

45

(19) Hydraulic Oil Filter

(19) Hydraulic Oil Filter

(1) Ride Control Accumulator

(31/32) Loader Valve

17

(24) Ride Control Manifold

(27) Ride Control Pressure Switch

(33) Auxiliary Loader Control Valve(43/44) Tilt Control Valve(38) Lift Control Valve(22/23) Control Manifold

(26) Implement and Steering Pump

(29/30) Backhoe Valve

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)

Components (By number)

YY

(52)

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

AUXILIARY CIRCUIT

MAIN PUMP OUTPUTLIFT CYLINDER CIRCUITBUCKET CYLINDER CIRCUITLOAD SENSE CIRCUITSTEERING CIRCUITSTICK CYLINDER CIRCUITSUPPLY LINEBOOM CYLINDER CIRCUITTILT CYLINDER CIRCUITEXTENDABLE STICK CYLINDER CIRCUITMULTIPURPOSE BUCKET CYLINDER CIRCUITDRAIN / RETURN LINESIDESHIFT CIRCUITSWING CYLINDER CIRCUITLOAD SENSE RELIEF CIRCUITSTABILIZER CYLINDER CIRCUIT

RE

NR

6482-0

324 P

ag

e,

(Dim

en

sio

ns:

34 i

nch

es x

28 i

nch

es)

THIS SCHEMATIC IS FOR THE 416E, 422E, and 428E BACKHOE LOADERMEDIA NUMBER: RENR6482-03PART NUMBER: 225-6836, CHANGE: 04, VERSION: -Components are shown installed on a fully operable machine.

Refer to the appropriate Service Manual for Troubleshooting, Specifications.

A

B

C

D

E

F

1234567

A

B

C

D

E

F

1234567

STABILIZERRH

STABILIZERLH

AUXILIARY

BOOM SWING BUCKET STICK

EXTENDABLESTICK

AUXILIARY

TILT

LIFT

T2T1

416E

AB

C

D

E

F

R

P

N

M

L

AB

C

D

E

F

G

HJK

R

P

N

M

L

SOS

(26) PUMP GP - PISTON (IMPLEMENT AND STEERING)

296-6714

(28) TANK GP - HYDRAULIC245-8777

(2) COOLER - TRANSMISSION HYDRAULIC OIL214-2202

(19) FILTER GP - OIL210-6243

(25) PUMP GP - METERING247-7868

(12) CYLINDER GP - STEERING214-5097

(6) CYLINDER GP -LIFT (LH)

228-3508 (416E)215-7298 (422E)

(7) CYLINDER GP -LIFT (RH)214-9373

(428E)

(16) CYLINDER GP - TILT

206-3553(416E, 422E)

(18) CYLINDER GP -TILT (RH)192-3884(428E)

(9) CYLINDER GP -MULTIPURPOSE BUCKET (RH)185-1839

(11) CYLINDER GP - STABILIZER (RH)262-7050 (416E)

173-4565 (422E, 428E)

(10) CYLINDER GP -STABILIZER (LH)262-7049 (416E)

173-4565 (422E, 428E)

(4) CYLINDER GP - BOOM210-7074 (ALL)

246-9885 (416E WITH CYLINDERPOSITION SENSOR)

(15) CYLINDER GP - SWING (RH)278-1971 (416E)

278-1973 (422E, 428E)

(14) CYLINDER GP -SWING (LH)

278-1971

(3) CYLINDER GP - BACKHOE BUCKET210-7086 (ALL)

210-7085 (416E WITH CYLINDER POSITION SENSOR)

(13) CYLINDER GP - STICK210-7077 (416E WITH CYLINDER POSITION SENSOR)210-7078 (416E WITHOUT SENSOR)210-7080 (422E, 428E)

(5) CYLINDER GP - EXTENDABLE STICK210-7098 (ALL)210-7097 (416E WITH CYLINDER POSITION SENSOR)

(29) VALVE GP - BANK (BACKHOE)248-0483 (6 BANK)248-0484 (7 BANK)248-0485 (8 BANK)(416E)

(30) VALVE GP - BANK (BACKHOE)248-0486 (6 BANK)248-0487 (7 BANK)248-0488 (8 BANK)(422E, 428E)

(45) VALVE GP -SHUTTLE8J-6875

(31) VALVE GP - BANK (LOADER)248-0481 (2 BANK)248-0482 (3 BANK)(416E, 422E)

(32) VALVE GP - BANK (LOADER)247-9655 (2 BANK)247-9656 (3 BANK)(428E)

(22) MANIFOLD GP - CONTROL (LOADER)259-6745(416E, 422E)

(23) MANIFOLD GP - CONTROL (LOADER)259-6743(428E)

(21) MANIFOLD GP -CONTROL (BACKHOE)

259-6744(422E, 428E)

(24) MANIFOLD GP -RIDE CONTROL

245-8780

(1) ACCUMULATOR GP -RIDE CONTROL162-3960

(27) SWITCH AS -PRESSURE (RIDE CONTROL)

304-5696

(38) VALVE GP -CONTROL (LIFT)259-6732

(44) VALVE GP -CONTROL (TILT)259-6740 (2 BANK)259-6741 (3 BANK)(428E)

(43) VALVE GP -CONTROL (TILT)259-6730 (3 BANK)259-6731 (2 BANK)(416E, 422E)

(33) VALVE GP - CONTROL(AUXILIARY) (LOADER)259-6729

(37) VALVE GP - CONTROL(EXTENDABLE STICK)

259-6734

(41) VALVE GP -CONTROL (STICK)259-6736 (6 BANK)259-6735 (7, 8 BANK)

(36) VALVE GP-CONTROL (BUCKET)259-6737

(42) VALVE GP -CONTROL (SWING)259-6738

(35) VALVE GP -CONTROL (BOOM)

259-6739

(34) VALVE GP - CONTROL(AUXILIARY) (BACKHOE)

259-6733

(20) MANIFOLD GP - CONTROL (BACKHOE)

259-6742(416E)

(40) VALVE GP -CONTROL (STABILIZER) (RH)

259-6746GHJK

422E, 428E

(39) VALVE GP -CONTROL (STABILIZER) (LH)

259-6746

(17) CYLINDER GP -TILT (LH)192-3884(428E)

(8) CYLINDER GP -MULTIPURPOSE BUCKET (LH)

185-1839